Reads a value in the form of a week-number within the year and returns a SAS date value using the W algorithm.

Category: | Date and Time |

The WEEKWw. informat reads the week-number value within
the year. If the input does not contain a year expression, the WEEKWw. informat uses the current year as the year
expression, which is the default. If the input does not contain a
day expression, the WEEKWw.
informat uses the first day of the week as the day expression, which
is the default. Algorithm W calculates the SAS date value using the
number of the week within the year (Monday is considered the first
day of the week). The number-of-week value is represented as a decimal
number in the range 0–53, with a leading zero and maximum value
of 53. For example, the fifth week of the year would be represented
as 05.

The inputs to the WEEKWw. informat are the same date for the following
example. The current year is 2012.

The WEEKWw. informat reads the week-number value as a
decimal number in the range 00–53, with Monday as the first
day of week.

The WEEKUw. informat reads the week-number value as a
decimal number in the range 00–53, with Sunday as the first
day of the week.

The WEEKVw. informat reads the week-number value as a
decimal number in the range 01–53, with Monday as the first
day of the week. Week one of the year is the week that includes both
January fourth and the first Thursday of the year. If the first Monday
of January is the second, third, or fourth, the preceding days are
part of the last week of the preceding year.

Function:

WEEK Function in SAS Functions and CALL Routines: Reference

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